Experimental Comparison of the 'AC Field'and 'Moving Grating' Techniques for BTO and BSO Crystals,
AKADEMIYA NAUK SSSR LENINGRAD FIZIKO-TEKHNICHESKII INSTITUT
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There are two techniques of nonstationary holographic recording which are widely used for PRCs with long drift lengths of photocarriers. There are recording of a moving interference pattern in an external DC electric field and recording of a fixed pattern in an AC field. Both of them allow the efficiency of the drift mechanism of recording in the external electric field to be increased and the recorded hologram to be transformed into a shifted one. The theory predicts equal efficiencies of two-wave energy exchange for these two techniques. In practice, the moving grating technique is traditionally employed for Bi12SiO20 BSO, but for Bi TiO BTO, recording in an AC field is in common use. Recent investigations of holographic recording in semi-insulating GaAsCr lambda1.06 um have demonstrated remarkable superiority of the moving grating mechanism.